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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df80e5da1a9ec972e9e6387ea4ecc191ff7312e8004eb6f9ed6c7499342a4323' 
  AND token = 'HUHkIXKmXEZewqWrjZCIX4J3P9WOPGYlqPxXj8HFYyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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