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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdd5d2b235f5382f50733bc54480d67ffb1f53d055dc65fb763c2e782092fb10' 
  AND token = 'niFDTvXsW4R3dkkt7ejpis3ZmFjp0kf0jmmTUi6PW18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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