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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f6a6fad3ed550c981d8153c25f8dce01c1c35b0caf2cb976381dd68de0368dd' 
  AND token = '4TrMPiTjIxFzcZd25+io2J/M6G8S/TyRSReaeWTxbSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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