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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d41b60df4840af90f8400d4f2f9924951e6adea5f1e10f8d0983953ca978d74' 
  AND token = '3jLTeKoKFShpMdDlCT1Dyl22csgCsIFoM8cdD5D2M10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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