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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f872c1048767c224be57235ebaa07796e9176639e95ec0e2ed330aeb4694fb9e' 
  AND token = 'RPX4n5s9Hd9I5fl3Pg13a9W67ZMEBEfljeJIcRvtnYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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