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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93c7b3eabbbd175c7fb1dbc27effddb8c0b257fd5c1e72df83ccdd4093ccd3fa' 
  AND token = 'NolSvLXge3Cy5Sw1nPaxGpfAg/3tdevlcnI3uYnWWVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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