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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '489ada6bcae6ffc821a751d6c743ca24dd9a91301440c5032bbe6d64b04344ca' 
  AND token = 'MGbEfAJ7r/AdQUUKayZeVGuKG0M7p8rpCsZJ8uQqdr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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