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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47eaf8dc7eb1c24afa008f02683461f8fdb5a4c56e74193ec13555e7000a4ac5' 
  AND token = 'Ul3kfUJ2KK0YhUxIWMGSjoMMIy1SMC4eHRoPmHDC4/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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