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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '464976803f663e467368352c4a9acaa829ec2419ddf3a3c602b565e6eaa5be26' 
  AND token = '0wYvTj/SmvUqhmWnMRAOYyioeABiOdggf6LI5eGPsQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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