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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '930de6fdda2b557e6dc4c85e094bbfee6ef93c0c3d7d0d959c9bf912ddcbeebd' 
  AND token = '/yYMLFGG+hqm5BTCPDFxZ9NWUiXXU1QcqTN3D3ZZ4Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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