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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38c790f6fd29d6bd89cf498be0f8b79ac931ac8e1a2970b250aac03df3331b33' 
  AND token = 'fYvSaJwarkDnClnZLXEzuotIj9ExFheM8kxw8pOGgAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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