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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6db8bada2234e88f4e18376ac8f69ee9b88da9ea849ebc185596b667b98bb81' 
  AND token = 'H58VuwhMEWAu3tUlW/xKKEouao+d0Lqc5aeQvZ32wbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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