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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fc6a1ad43b9329b183d50350dabd30daa7dc21b91b8b1fc0d57eee31fcc9b20' 
  AND token = '1yyW4UnIj2vsylZzuw9bopdO10DiIy4D9FHltP/utJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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