SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '912c60f2c7de10b68a55c36c7b23e0afb68479572ea0a7e733b200e61a9006ce' 
  AND token = 'CRLY8i/g+LxtZ8ptntya5zzwBrnnuqOQgFhVi4lfLAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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