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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aac6997e92e3cbe2b80d80cb165fcc6aa5e11a5dececfdc3cd6aedaad2413235' 
  AND token = 'z/8PZO0505KgNnXC1xaKazqm4l0wZTwBXWjDzbVGkP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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