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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5853d3f2ff0144643ee93338644fbe8a904f7b3ccb153c0f55620c0a2ee28bbb' 
  AND token = 'cMuZykxVPXGoC3DpR34ml0906JXFaDnlb6vqdNaljK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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