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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd73c352e85c8a587a052ff00d4633d65cf1058d9d2fdbf664caf0800ec64c71' 
  AND token = 'DINUbETPYEi54Aet0H58HBOa/sdqGCjqvYAQYHTVjPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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