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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ce4d60f67f6f78670014ebab8326717ab182e2bb28e977bcad927d602fd39f2' 
  AND token = 'DYjMmYYJSM08Kgu14zumuxw8uMt6/ryYWOqyVP3UnSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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