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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6db2e9220cff9c2668c5ebdea98948eb827293b91202cda47100974e2479f6b' 
  AND token = 'cdUN7zLGvMbgGG5umRTh624/Lox8WA/r8+AQUbCmjwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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