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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a44e57af2bf8438d3609d82f818bd4a7292f9195e5abbb297059fd71fad7d5d' 
  AND token = 'Uu1BjyLAbqLDAJ59gLIe6Z7/yN3eWm6Nk/X98lDdEt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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