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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0aa9b5570aff63ccccffa6b3c126001642c9cd1293cf6f9159cff346eb4efe9' 
  AND token = 'dA89nwcHUzAkHoiH0sbUlTbMztXHc2sdsH4P8jM136A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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