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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d5f561bb4e970a1aa192d886e1c8f3d69cbf1bdf24e23e3ddd84d674ab1933b' 
  AND token = '/mqZEJls8qDvM5iVSa8if+CTkonanGb7od3QuM74Vyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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