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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68f248648eda48fc2ab6d25f040d7d19b5285d04449d8a7d858f0da6b116c48e' 
  AND token = 'MzykkGsffFfV8dlvQVB60zZA9FixqNiFrPTjkX/g50M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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