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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cc91eca6a64f2e87990ef74f17fe51bbd55a36e3e54c2b18dc34fb1091c7fb4' 
  AND token = 'chDesYsaalsq4TooBPfLVNKFyhStcfT6jvS2qX9jKCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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