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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b85d772312b825497215f82e848479cb866240f48790ada16c9197771b6c0518' 
  AND token = 'oy3VZHFTClbPoj4xiSR742eeLdNCGsRZMpCd7pwEQME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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