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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be140d74f44da12c91f43bf814e8a424ddaac0a8abf01b6a6fd51369f2e16e75' 
  AND token = 'wRP/8Q9svtBVpmwWXiyPGUR6wMo9qSC2k9d8wef453w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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