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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9813a77f03164bf7e2edb4ca18d869ae5e997d4b2735f750908a73851e09f24d' 
  AND token = 'XK4jGffKtZ67MNx7a02yACOJjrtid74l2+I4L7P/h9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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