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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f66d4421d78aabab1f203c04a6106c13e1d62eceeee86867dc0196cbe83e92f' 
  AND token = 'LdBb4ktegO0d5yQKbpuhQ8y8fRfqmbi3FL5fEFkTV/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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