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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6981c53ab0011023d9b382238d83c081be15e472a841d1ee88e74dac86507b7' 
  AND token = 'Tllg5S/TykI/NGUX7uhCyHLNIEyxgNslQRIiWkh2pIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}