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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b1ed3b3dcc763e39078aa64d7fb2115ef37c3add5353a897b33d80bd926c6ca' 
  AND token = 'qeekLTtnqpjGA939DQ0TDQiRW2ImgutdSorxmo5yfuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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