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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24dc4d1adea618b7ee11a871436510890367019a4b75c1a028414dc8633a0994' 
  AND token = 'hh+h8fcTbkUW7LE5fJMkP960dCDglcQ1AdEBhEvkmKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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