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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '024b9453381d5fd62c2e17c12e4e3877c292fc8ecfa339b7d857a227ecd36871' 
  AND token = '0O27kq2NxjOJ4GruKKSrZn2R2TxoBEF1S+zYXHS5LbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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