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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7a9d3813bccfb5e19989d23d84a8e20bc4105bcca0ebf9574e0a80995911467' 
  AND token = 'OTjk0FGaTHDTU5ry4Cz9c1IHiMlj/NX5PfrBquF/MK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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