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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9495c0503e7a63de0af882035ab03c89d5df7999850c627d469c5e97234579f7' 
  AND token = 'amLllnBKFPzTwCV9073HGxoC5ZW3JU0G6oeWB7AQYeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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