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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cea3b4ec25e7e31ad99ce77e46fc3d65246be46f230a9cc5f058379bbcd14c9' 
  AND token = 'DCaYbpSk4YzFgTmVvkVr5RaPvVipKriyU9O4mNfd93w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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