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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1de0603cd01af82ca136bfc4d29786f8f80267fb2d501a1b775f6ce3fb603c9f' 
  AND token = 'S9GEElKkRvxcS/N1UHwKvrt3cq+jh6z1ybp0hbxqD+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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