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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '248938bc4ab668016fa54c6b6e24de57d4b22331d9e43dc6f1ba84f47b5b59fd' 
  AND token = 'iPV8pcZ6xb4QVZK5AjKJ3e2/WE4Sik1qsRllQZympMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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