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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cd1b8ce441230504a329b09a4b679668a5da445dc1a0ee9a644f2c1c16d5608' 
  AND token = 'oGMu3RbCzrVvbEtXoOCm4QpnC9b8ff/qsWmKdEYAwbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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