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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '575b63785db71cb3090cde0e65b67cb38b43188dd1df1ca5f1e6973efd20eeab' 
  AND token = 'xO5FSOuDLOYwtSkxXLY/lo7P36LuSV/+DnsCFxDsv6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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