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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d3412b8f6698ed5f34084ab0c556ab5f7c7215f7880b92bbd48054ff7744735' 
  AND token = 'An+trsa90EWj6/Qtw3aDCCuK4gcgQNpPbBwISyc7FLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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