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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ceef87a3138c5840c5dc3fef0d3f1550318bdf666e325cea0c510f5b88214e6' 
  AND token = 'k7t0kG8PFeUnwFm0/3tuEFXkA5hOeAQeRJDoKdk4u58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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