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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afca00aefd63ff8553c4d974ecf1a2024433cf2098b2dddfb96a292b12ce6ef3' 
  AND token = 'vwO80bSpS7ZMNX3j/2b90gu781OB2EdQ07MbPRuZ/64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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