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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92679f685ba1cf18be4dc88b25090db71cd9cb0390a524bfe10ae6afed72f7f1' 
  AND token = 'OMBr0xgL8LlVqh62jeDvs1LGfWi4SGaNFvMqMRvjR2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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