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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b9db3edebb2e6c9e8785caf07df454499ef4652a540747068cca244a67b7d73' 
  AND token = 'djOfIvnZQDn0pSrpM4Z/QmL66Bt1/MWF0u6SEQP0t7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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