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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc75c9eed138b7b66b200cdd3c2605aaf909ec396a4771453aa78bbed6497a06' 
  AND token = '08K0SDefdqcMIz/HYIZr2j2awHIyVywoKQ7CUIMyHxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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