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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0bd0a5c3f8cfacf630b8247102b6aef1f21b74d7385a70efc580ff5713d2183' 
  AND token = '7Mj166dmDCh6dZq4WosxXzZ3sqUv0ZN6yw1Zj/aq3jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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