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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3110f8306c5ca2eba082cce705a4e06f96c671c43337c02d80308c364c99104' 
  AND token = 'DU7cDtsdPugNdh34P+wOFSoXm05O54td2EZLTvQWRXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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