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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36d5207484e3c3e171c868a9a49d6b43538ee714f50ca8f93fffc3e07c7a1d27' 
  AND token = 'dTNhmgDTTNIDJylfMKk9S7XVKA+RmU4D+9uT0RJkZNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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