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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '169cd1e139501e7e4c12d4fa88b0fe31b1006d6ad3dad1ed0618cd45f5c8d157' 
  AND token = 'hq7G5dD3XcYmFM2ixRgJuZUud1xV0Xsy8+kGB9OLZBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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