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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6312a4e12a603c4d1b5bce2b0da694405e31d2facb70fc5ebba318c809589370' 
  AND token = 'G27vFspfjog6ldQuFGJcI8vu+IhFSeFlpFOtpOESGOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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